Yes you are correct it’s a large journal engine .Chevy never made a 4bolt main 327 engine. They made the large journal 327 in 1968 and they made the 350 in 1967 as a large journal engine for camaros, heard rumors of it being a 4bolt, but have never seen one. Also in 68 chevy did away with the 283 and made the 307. The 307 used the 283 bore and the 327 crank. The old school trick for building a 302 was using a small journal 283 crank in a small journal 327 block for most of us that couldnt afford a real 302. Chevy only built a little over 600 302s in 1967.